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HP Recommended
DesignJet T790 44inch PS
Mac OS X 10.11 El Capitan

We have a recurring problem with our T790 (secondhand, out of guarantee), where the yellow simply and suddenly disappears in the middle of a large print (after 80 cm or so). When plotting narrow formats like 90x30cm, then typically the first two will be fine and yellow will fail during the third. If we turn the machine off for the weekend (and do absolutely nothing else) it will usually be fine on Monday morning - for the first 80 cm or so.

 

There is plenty of ink in the cartridge, which is nearly new (well within its expiry date). Genuine HP ink too.

 

Print-head nozzles are all fine. The test diagnostic print from HP Utility (mac) is absolutely error-free, not a single spot or splodge or stripe anywhere in it — except that sometimes all the yellow is missing.

 

It seems like the plotter "forgets" to pull yellow ink from the cartridge.

 

Has anyone seen this before? What is the cause, and what is the solution?

 

Thanks in advance

John / Bauatelier Architekten

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